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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Asymmetric public-key algorithm definitions
*
* See Documentation/crypto/asymmetric-keys.rst
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#ifndef _LINUX_PUBLIC_KEY_H
#define _LINUX_PUBLIC_KEY_H
#include <linux/errno.h>
#include <linux/keyctl.h>
#include <linux/oid_registry.h>
/*
* Cryptographic data for the public-key subtype of the asymmetric key type.
*
* Note that this may include private part of the key as well as the public
* part.
*/
struct public_key {
void *key;
u32 keylen;
enum OID algo;
void *params;
u32 paramlen;
bool key_is_private;
const char *id_type;
const char *pkey_algo;
unsigned long key_eflags; /* key extension flags */
#define KEY_EFLAG_CA 0 /* set if the CA basic constraints is set */
#define KEY_EFLAG_DIGITALSIG 1 /* set if the digitalSignature usage is set */
#define KEY_EFLAG_KEYCERTSIGN 2 /* set if the keyCertSign usage is set */
};
extern void public_key_free(struct public_key *key);
/*
* Public key cryptography signature data
*/
struct public_key_signature {
struct asymmetric_key_id *auth_ids[3];
u8 *s; /* Signature */
u8 *digest;
u32 s_size; /* Number of bytes in signature */
u32 digest_size; /* Number of bytes in digest */
const char *pkey_algo;
const char *hash_algo;
const char *encoding;
};
extern void public_key_signature_free(struct public_key_signature *sig);
extern struct asymmetric_key_subtype public_key_subtype;
struct key;
struct key_type;
union key_payload;
extern int restrict_link_by_signature(struct key *dest_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trust_keyring);
extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trusted);
extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trusted);
#if IS_REACHABLE(CONFIG_ASYMMETRIC_KEY_TYPE)
extern int restrict_link_by_ca(struct key *dest_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trust_keyring);
int restrict_link_by_digsig(struct key *dest_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trust_keyring);
#else
static inline int restrict_link_by_ca(struct key *dest_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trust_keyring)
{
return 0;
}
static inline int restrict_link_by_digsig(struct key *dest_keyring,
const struct key_type *type,
const union key_payload *payload,
struct key *trust_keyring)
{
return 0;
}
#endif
extern int query_asymmetric_key(const struct kernel_pkey_params *,
struct kernel_pkey_query *);
extern int verify_signature(const struct key *,
const struct public_key_signature *);
#if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig);
#else
static inline
int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig)
{
return -EINVAL;
}
#endif
#endif /* _LINUX_PUBLIC_KEY_H */
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